Correct answer
Be anti-fog.
They should be anti-fog, impact-resistant, well fitted and provide a wide field of vision. Glass lenses should not be required instead of plastic: the DGT guide favours materials such as polycarbonate over mineral lenses for impact resistance. Needed optical correction and a tint suited to lighting are separate matters; do not use dark lenses that impair night vision.
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Be anti-fog.
Always be dark, even at night.
Be designed to mist easily.
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